We signed Sosa back in January, here:
#20 José Ernesto Sosa
People look at Serie A, La Liga and the Premiership as the top leagues and only accept to play there, so it's no easy to attract class players to the Bundesliga, we had to pay tons of cash for Luca Toni to accept our contract offer.
As for players coming all to the same club, Bayern are the only club in Germany with enough money to cover all these transfers, Werder Bremen, Schalke and Stuttgart can't compare to Bayern financially.
Nothing can be done about that, Bayern have established themselves as the top club in Germany that dominates the Bundesliga, the other clubs can only rely on signing great players from the smaller clubs, like Klose from Kaiserslautern to Werder or some bargains from other clubs like Diego to Werder.
The Bundesliga is underrated, it's definately as good as all the others, but doesn't have the same media coverage and the same hype by the media, as the other 3 top leagues do. Although the Bundelsiga has the highest attendance in Europe
